Charging device for sintering apparatus



March 26, 1940. H. WENDEBORN CHARGING DEVICE FOR SINTERING APR-ARATUS Filed March 28, 1939 In ventap:

Patented Mar. 26, 1940 UNITED STATES PATENT OFFICE;

CHARGING DEVICE FOR SINTERING APPARATUS York Application March 28,

1939, Serial No 264,626

In Germany April 9, 1938 9 Claims.

This invention relates to a charging device for sintering apparatus.

In order to obtain good sintering in blast roasting apparatus of the suction type, loose and uniform charging of the material charged is an absolute essential. I

To this end use has hitherto been made of rocking troughs which are disposed beneath the charging hopper and are adapted to be moved at right angles to the direction of movement of the sintering grate. This type of charging, however, involves two disadvantages in the first place the material does not always slide'in the trough at the same speed, 'so that the height of the layer on the sintering apparatus varies, while in the second place segregation of the charge mixture takes place when the charge leaves the trough, the result of which is uneven or incomplete sinterlng.

Another known device consists of a roller discharge means, in which the amount discharged is regulated by opening a vertical slide valve above the roller. Coarse grains in the charge material frequently cause clogging in this device,

by becoming jammed between the slide valve and the discharge roller, which naturally likewise leads to uneven height of the layer on the grate.

The present invention aims at eliminating the foregoing disadvantages and diificulties in known discharge devices. In accordance with the invention, both the amount of sintering material discharged from the charging container and the amount charged on to the sintering grate, are regulated with great constancy, in respect of volume and time.

For the solution of the foregoing problem, it has already been proposed to provide buckets enclosed on all sides and fastened in endless chains, said buckets conveying the material from the bunker, disposed beneath the grate, on to the grate, disposed at a higher level.

In contradistinction to such known bucket conveyors, the material is charged on to the sintering apparatus, according to the present invention, by an endless box band the boxes of which are so constructed that only the front side of the boxes-which are open both at the rear side and at the top and b0ttom--is secured to the endless band, while these boxes--in contradistinction to the hitherto known direction of movement-move obliquely downwards from top to bottom.

In order more clearly to understand the invention reference is made to the accompanying drawing, which illustrates diagrammatically and by way of example, one embodiment thereof, and in which:---

Fig. 1 is a vertical section through the charging device with the. bunker outlet disposed thereabove and the suction-draught blast roasting apparatus, that is the grate thereof, disposed therebeneath; and

Fig. 2 is a vertical section along the line a-a of Fig, 1, namely through the charging device at right angles to the sectional plane of Fig. 1, in order to illustrate the arrangement of the bunker outlet in relation to the box band.

I denotes the bunker outletabove the box band with the boxes 2. T'he'several boxes 2 possess three vertical lateral boundaries and are open on the third side and also at the top and bottom. The rear walls H! of the boxes 2 are riveted on to the belt 3 constituting the endless band, for example by means of angle-irons ll, while the two opposite side walls of the boxes 2 are not securely fixed to the band, in order that they may be free to rise from their support at the turning points of the band (which moves, if desired, in a triangle), and can be seen from Fig. 1.

eral rollers-in the embodiment illustrated over three rollers 4, 6 and |--and preferably in an oblique-angled triangle, while one roller can advantageously act at the same time as a tensioning roller in conjunction with the tensioning device 5.

The endless .box band is arranged beneath the bunker outlet, according to the invention, in such a manner that a part of the boxes is constantly filled when sliding past beneath the outlet I and thus at the same time closes thebunker outlet. The boxes are then moved, with their vertical rear walls l0 inclined, downwards towards the grate 9 of the suction-draught sintering apparatus in order to pour out their contents onto the grate 9, in always constant amounts, at the turning point facing the grate 9 (roller 1). A pusher 8, in conjunction with the speed of rotation of the endless band 3, gives furtherassurance of .a constant thickness of the layer of charge material on the grate 9.

Instead of three rollers, the band may also be guided over four rollers, so that it is guided horizontally not only beneath the bunker outlet I, but also above the grate 9, in which case the upper edge of the vertical rear walls l0 can attend to the final levelling of the material poured on to the grate 9, if the boxes be moved in the same direction as the grate 9 instead. of in the opposite direction to the movement of said grate.

The belt or endless band 3 is guided over sev-- I claim:

1. Sintering apparatus comprising an endless band capable of supporting the material to be sintered, means supporting said band for continuous movement, boxes carried by said band, said boxes extending transversely of said band and having only front and end walls and a sintering grate positioned to receive the material discharged from saidboxes.

2. Sintering apparatus as defined in claim 1 in which the boxes are hinged to the band at their forward lower edges- 3. Sintering apparatus comprising a bunker provided with an outlet for the gravitational discharge of solid material, a conveyor comprising an endless band capable of supporting the material to be sintered, means for supporting said band for continuous movement, said their front lower edges.

5. Sintering apparatus as defined in claim 3 in wln'ch the path of the band comprises a horizontal portion immediately below the outlet of the bunker and a sloping portion extending downwardly to the point of discharge.

6. A charging device for sintering apparatus comprising a bunker provided with an outlet for the gravitational discharge of solid material, a

v sintering grate at a lower level than the bunker a pusher for levelling the surface of the material charged on to the sintering grate.

8. A conveyor as defined in claim 6 comprising a plurality of rollers for movably supporting the endless band' at least one of said rollers being movable to tension the band.

9. A charging device comprising a bunker provided with an outlet for the gravitational dis charge of solid material, a sintering grate positioned at a lower level than said outlet, a conveyor for transferring material from said outlet to said grate, said convoyer comprising a band capable of supporting the material and mounted for continuous movement in a closed path, a portion of said path immediately below said outlet and another portion of said path immediately above said grate extending horizontally, another portion of said path sloping downwardly from the first mentioned portion to the second men* tioned portion, and boxes extending transversely of and carried by said band, said boxes having only front and end walls and being hinged to the a band adjacent the lower edge of the front Wall.

HELMUT WENDEBORN. 

